Designation:D3152–72(Reapproved2000)AnAmericanNationalStandardStandardTestMethodforCapillary-MoistureRelationshipsforFine-TexturedSoilsbyPressure-MembraneApparatus1ThisstandardisissuedunderthefixeddesignationD3152;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofcapillary-moisturepropertiesoffine-texturedsoilsasindicatedbythemoisturecontent-moisturetensionrelationshipsdeterminedbypressure-membraneapparatususingtensionsbetween1and15atm(101and1520kPa).Moisturetension(matrixsuction)isdefinedastheequivalentnegativegagepressure,orsuction,insoilmoisture.Thetestresultisamoisturecontentwhichisameasureofthewaterretainedinthesoilsubjectedtoagivensoil-watertension(oratanapproximatelyequivalentheightabovethewatertable).NOTE1—Fordeterminationofcapillary-moisturerelationshipsofcoarse-andmedium-texturedsoils,refertoTestMethodD2325.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D421PracticeforDryPreparationofSoilSamplesforParticle-SizeAnalysisandDeterminationofSoilCon-stants2D698TestMethodforLaboratoryCompactionCharacter-isticsofSoilUsingStandardEffort(12,400ft–lbf/ft3(600kN–m/m3))2D2325TestMethodforCapillary-MoistureRelationshipsforCoarse-andMedium-TexturedSoilsbyPorous-PlateApparatus23.SummaryofTestMethod3.1Saturatedsoilsamplesareplacedincontactwithasaturatedporousmembranerestingonascreendiskinstalledwithinahigh-pressurechamber.Thebottomofthemembrane-screenassemblyismaintainedatatmosphericpressurebymeansofasmalldraintubeoropeningthroughthebottomofthepressurechamber.Adesiredairpressureadmittedto...
